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gtk2/gtk/gtkrbtree.c
Jonathan Blandford 050625298e Clean up height code a bit. I don't think it's completely correct yet, but 
Fri Nov  2 16:45:17 2001  Jonathan Blandford  <jrb@redhat.com>

	* gtk/gtkrbtree.c (_gtk_rbtree_remove_node): Clean up height code
	a bit.  I don't think it's completely correct yet, but it's
	getting there.
2001-11-02 21:47:27 +00:00

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/* gtkrbtree.c
* Copyright (C) 2000 Red Hat, Inc., Jonathan Blandford <jrb@redhat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "gtkrbtree.h"
#include "gtkdebug.h"
static void _gtk_rbnode_validate_allocator (GAllocator *allocator);
static GtkRBNode *_gtk_rbnode_new (GtkRBTree *tree,
gint height);
static void _gtk_rbnode_free (GtkRBNode *node);
static void _gtk_rbnode_rotate_left (GtkRBTree *tree,
GtkRBNode *node);
static void _gtk_rbnode_rotate_right (GtkRBTree *tree,
GtkRBNode *node);
static void _gtk_rbtree_insert_fixup (GtkRBTree *tree,
GtkRBNode *node);
static void _gtk_rbtree_remove_node_fixup (GtkRBTree *tree,
GtkRBNode *node);
static gint _count_nodes (GtkRBTree *tree,
GtkRBNode *node);
/* node allocation
*/
struct _GAllocator /* from gmem.c */
{
gchar *name;
guint16 n_preallocs;
guint is_unused : 1;
guint type : 4;
GAllocator *last;
GMemChunk *mem_chunk;
GtkRBNode *free_nodes; /* implementation specific */
};
G_LOCK_DEFINE_STATIC (current_allocator);
static GAllocator *current_allocator = NULL;
/* HOLDS: current_allocator_lock */
static void
_gtk_rbnode_validate_allocator (GAllocator *allocator)
{
g_return_if_fail (allocator != NULL);
g_return_if_fail (allocator->is_unused == TRUE);
if (allocator->type != G_ALLOCATOR_NODE)
{
allocator->type = G_ALLOCATOR_NODE;
if (allocator->mem_chunk)
{
g_mem_chunk_destroy (allocator->mem_chunk);
allocator->mem_chunk = NULL;
}
}
if (!allocator->mem_chunk)
{
allocator->mem_chunk = g_mem_chunk_new (allocator->name,
sizeof (GtkRBNode),
sizeof (GtkRBNode) * allocator->n_preallocs,
G_ALLOC_ONLY);
allocator->free_nodes = NULL;
}
allocator->is_unused = FALSE;
}
static GtkRBNode *
_gtk_rbnode_new (GtkRBTree *tree,
gint height)
{
GtkRBNode *node;
G_LOCK (current_allocator);
if (!current_allocator)
{
GAllocator *allocator = g_allocator_new ("GTK+ default GtkRBNode allocator",
128);
_gtk_rbnode_validate_allocator (allocator);
allocator->last = NULL;
current_allocator = allocator;
}
if (!current_allocator->free_nodes)
node = g_chunk_new (GtkRBNode, current_allocator->mem_chunk);
else
{
node = current_allocator->free_nodes;
current_allocator->free_nodes = node->left;
}
G_UNLOCK (current_allocator);
node->left = tree->nil;
node->right = tree->nil;
node->parent = tree->nil;
node->flags = GTK_RBNODE_RED;
node->parity = 1;
node->count = 1;
node->children = NULL;
node->offset = height;
return node;
}
static void
_gtk_rbnode_free (GtkRBNode *node)
{
G_LOCK (current_allocator);
node->left = current_allocator->free_nodes;
current_allocator->free_nodes = node;
if (gtk_debug_flags & GTK_DEBUG_TREE)
{
/* unfortunately node->left has to continue to point to
* a node...
*/
node->right = (gpointer) 0xdeadbeef;
node->parent = (gpointer) 0xdeadbeef;
node->offset = 56789;
node->count = 56789;
node->flags = 0;
}
G_UNLOCK (current_allocator);
}
static void
_gtk_rbnode_rotate_left (GtkRBTree *tree,
GtkRBNode *node)
{
gint node_height, right_height;
guint node_parity, right_parity;
GtkRBNode *right = node->right;
g_return_if_fail (node != tree->nil);
node_height = node->offset -
(node->left?node->left->offset:0) -
(node->right?node->right->offset:0) -
(node->children?node->children->root->offset:0);
right_height = right->offset -
(right->left?right->left->offset:0) -
(right->right?right->right->offset:0) -
(right->children?right->children->root->offset:0);
node_parity = node->parity -
(node->left?node->left->parity:0) -
(node->right?node->right->parity:0) -
(node->children?node->children->root->parity:0);
right_parity = right->parity -
(right->left?right->left->parity:0) -
(right->right?right->right->parity:0) -
(right->children?right->children->root->parity:0);
node->right = right->left;
if (right->left != tree->nil)
right->left->parent = node;
if (right != tree->nil)
right->parent = node->parent;
if (node->parent != tree->nil)
{
if (node == node->parent->left)
node->parent->left = right;
else
node->parent->right = right;
} else {
tree->root = right;
}
right->left = node;
if (node != tree->nil)
node->parent = right;
node->count = 1 + (node->left?node->left->count:0) +
(node->right?node->right->count:0);
right->count = 1 + (right->left?right->left->count:0) +
(right->right?right->right->count:0);
node->offset = node_height +
(node->left?node->left->offset:0) +
(node->right?node->right->offset:0) +
(node->children?node->children->root->offset:0);
right->offset = right_height +
(right->left?right->left->offset:0) +
(right->right?right->right->offset:0) +
(right->children?right->children->root->offset:0);
node->parity = node_parity +
(node->left?node->left->parity:0) +
(node->right?node->right->parity:0) +
(node->children?node->children->root->parity:0);
right->parity = right_parity +
(right->left?right->left->parity:0) +
(right->right?right->right->parity:0) +
(right->children?right->children->root->parity:0);
if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_DESCENDANTS_INVALID))
{
if ((! GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID)) &&
(node->right != tree->nil && ! GTK_RBNODE_FLAG_SET (node->right, GTK_RBNODE_DESCENDANTS_INVALID)) &&
(node->left != tree->nil && ! GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID)) &&
(node->children && GTK_RBNODE_FLAG_SET (node->children->root, GTK_RBNODE_DESCENDANTS_INVALID)))
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
}
if (GTK_RBNODE_FLAG_SET (right, GTK_RBNODE_DESCENDANTS_INVALID))
{
if ((! GTK_RBNODE_FLAG_SET (right, GTK_RBNODE_INVALID)) &&
(right->right != tree->nil && ! GTK_RBNODE_FLAG_SET (right->right, GTK_RBNODE_DESCENDANTS_INVALID)) &&
(right->left != tree->nil && ! GTK_RBNODE_FLAG_SET (right->left, GTK_RBNODE_DESCENDANTS_INVALID)) &&
(right->children && GTK_RBNODE_FLAG_SET (right->children->root, GTK_RBNODE_DESCENDANTS_INVALID)))
GTK_RBNODE_UNSET_FLAG (right, GTK_RBNODE_DESCENDANTS_INVALID);
}
}
static void
_gtk_rbnode_rotate_right (GtkRBTree *tree,
GtkRBNode *node)
{
gint node_height, left_height;
guint node_parity, left_parity;
GtkRBNode *left = node->left;
g_return_if_fail (node != tree->nil);
node_height = node->offset -
(node->left?node->left->offset:0) -
(node->right?node->right->offset:0) -
(node->children?node->children->root->offset:0);
left_height = left->offset -
(left->left?left->left->offset:0) -
(left->right?left->right->offset:0) -
(left->children?left->children->root->offset:0);
node_parity = node->parity -
(node->left?node->left->parity:0) -
(node->right?node->right->parity:0) -
(node->children?node->children->root->parity:0);
left_parity = left->parity -
(left->left?left->left->parity:0) -
(left->right?left->right->parity:0) -
(left->children?left->children->root->parity:0);
node->left = left->right;
if (left->right != tree->nil)
left->right->parent = node;
if (left != tree->nil)
left->parent = node->parent;
if (node->parent != tree->nil)
{
if (node == node->parent->right)
node->parent->right = left;
else
node->parent->left = left;
}
else
{
tree->root = left;
}
/* link node and left */
left->right = node;
if (node != tree->nil)
node->parent = left;
node->count = 1 + (node->left?node->left->count:0) +
(node->right?node->right->count:0);
left->count = 1 + (left->left?left->left->count:0) +
(left->right?left->right->count:0);
node->offset = node_height +
(node->left?node->left->offset:0) +
(node->right?node->right->offset:0) +
(node->children?node->children->root->offset:0);
left->offset = left_height +
(left->left?left->left->offset:0) +
(left->right?left->right->offset:0) +
(left->children?left->children->root->offset:0);
node->parity = node_parity +
(node->left?node->left->parity:0) +
(node->right?node->right->parity:0) +
(node->children?node->children->root->parity:0);
left->parity = left_parity +
(left->left?left->left->parity:0) +
(left->right?left->right->parity:0) +
(left->children?left->children->root->parity:0);
if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_DESCENDANTS_INVALID))
{
if ((! GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID)) &&
(node->right != tree->nil && ! GTK_RBNODE_FLAG_SET (node->right, GTK_RBNODE_DESCENDANTS_INVALID)) &&
(node->left != tree->nil && ! GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID)) &&
(node->children && GTK_RBNODE_FLAG_SET (node->children->root, GTK_RBNODE_DESCENDANTS_INVALID)))
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
}
if (GTK_RBNODE_FLAG_SET (left, GTK_RBNODE_DESCENDANTS_INVALID))
{
if ((! GTK_RBNODE_FLAG_SET (left, GTK_RBNODE_INVALID)) &&
(left->right != tree->nil && ! GTK_RBNODE_FLAG_SET (left->right, GTK_RBNODE_DESCENDANTS_INVALID)) &&
(left->left != tree->nil && ! GTK_RBNODE_FLAG_SET (left->left, GTK_RBNODE_DESCENDANTS_INVALID)) &&
(left->children && GTK_RBNODE_FLAG_SET (left->children->root, GTK_RBNODE_DESCENDANTS_INVALID)))
GTK_RBNODE_UNSET_FLAG (left, GTK_RBNODE_DESCENDANTS_INVALID);
}
}
static void
_gtk_rbtree_insert_fixup (GtkRBTree *tree,
GtkRBNode *node)
{
/* check Red-Black properties */
while (node != tree->root && GTK_RBNODE_GET_COLOR (node->parent) == GTK_RBNODE_RED)
{
/* we have a violation */
if (node->parent == node->parent->parent->left)
{
GtkRBNode *y = node->parent->parent->right;
if (GTK_RBNODE_GET_COLOR (y) == GTK_RBNODE_RED)
{
/* uncle is GTK_RBNODE_RED */
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (y, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent->parent, GTK_RBNODE_RED);
node = node->parent->parent;
}
else
{
/* uncle is GTK_RBNODE_BLACK */
if (node == node->parent->right)
{
/* make node a left child */
node = node->parent;
_gtk_rbnode_rotate_left (tree, node);
}
/* recolor and rotate */
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent->parent, GTK_RBNODE_RED);
_gtk_rbnode_rotate_right(tree, node->parent->parent);
}
}
else
{
/* mirror image of above code */
GtkRBNode *y = node->parent->parent->left;
if (GTK_RBNODE_GET_COLOR (y) == GTK_RBNODE_RED)
{
/* uncle is GTK_RBNODE_RED */
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (y, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent->parent, GTK_RBNODE_RED);
node = node->parent->parent;
}
else
{
/* uncle is GTK_RBNODE_BLACK */
if (node == node->parent->left)
{
node = node->parent;
_gtk_rbnode_rotate_right (tree, node);
}
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent->parent, GTK_RBNODE_RED);
_gtk_rbnode_rotate_left (tree, node->parent->parent);
}
}
}
GTK_RBNODE_SET_COLOR (tree->root, GTK_RBNODE_BLACK);
}
static void
_gtk_rbtree_remove_node_fixup (GtkRBTree *tree,
GtkRBNode *node)
{
while (node != tree->root && GTK_RBNODE_GET_COLOR (node) == GTK_RBNODE_BLACK)
{
if (node == node->parent->left)
{
GtkRBNode *w = node->parent->right;
if (GTK_RBNODE_GET_COLOR (w) == GTK_RBNODE_RED)
{
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_RED);
_gtk_rbnode_rotate_left (tree, node->parent);
w = node->parent->right;
}
if (GTK_RBNODE_GET_COLOR (w->left) == GTK_RBNODE_BLACK && GTK_RBNODE_GET_COLOR (w->right) == GTK_RBNODE_BLACK)
{
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_RED);
node = node->parent;
}
else
{
if (GTK_RBNODE_GET_COLOR (w->right) == GTK_RBNODE_BLACK)
{
GTK_RBNODE_SET_COLOR (w->left, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_RED);
_gtk_rbnode_rotate_right (tree, w);
w = node->parent->right;
}
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_GET_COLOR (node->parent));
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (w->right, GTK_RBNODE_BLACK);
_gtk_rbnode_rotate_left (tree, node->parent);
node = tree->root;
}
}
else
{
GtkRBNode *w = node->parent->left;
if (GTK_RBNODE_GET_COLOR (w) == GTK_RBNODE_RED)
{
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_RED);
_gtk_rbnode_rotate_right (tree, node->parent);
w = node->parent->left;
}
if (GTK_RBNODE_GET_COLOR (w->right) == GTK_RBNODE_BLACK && GTK_RBNODE_GET_COLOR (w->left) == GTK_RBNODE_BLACK)
{
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_RED);
node = node->parent;
}
else
{
if (GTK_RBNODE_GET_COLOR (w->left) == GTK_RBNODE_BLACK)
{
GTK_RBNODE_SET_COLOR (w->right, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_RED);
_gtk_rbnode_rotate_left (tree, w);
w = node->parent->left;
}
GTK_RBNODE_SET_COLOR (w, GTK_RBNODE_GET_COLOR (node->parent));
GTK_RBNODE_SET_COLOR (node->parent, GTK_RBNODE_BLACK);
GTK_RBNODE_SET_COLOR (w->left, GTK_RBNODE_BLACK);
_gtk_rbnode_rotate_right (tree, node->parent);
node = tree->root;
}
}
}
GTK_RBNODE_SET_COLOR (node, GTK_RBNODE_BLACK);
}
/* Public functions */
void
_gtk_rbnode_push_allocator (GAllocator *allocator)
{
G_LOCK (current_allocator);
_gtk_rbnode_validate_allocator ( allocator );
allocator->last = current_allocator;
current_allocator = allocator;
G_UNLOCK (current_allocator);
}
void
_gtk_rbnode_pop_allocator (void)
{
G_LOCK (current_allocator);
if (current_allocator)
{
GAllocator *allocator;
allocator = current_allocator;
current_allocator = allocator->last;
allocator->last = NULL;
allocator->is_unused = TRUE;
}
G_UNLOCK (current_allocator);
}
GtkRBTree *
_gtk_rbtree_new (void)
{
GtkRBTree *retval;
retval = (GtkRBTree *) g_new (GtkRBTree, 1);
retval->parent_tree = NULL;
retval->parent_node = NULL;
retval->nil = g_new0 (GtkRBNode, 1);
retval->nil->left = NULL;
retval->nil->right = NULL;
retval->nil->parent = NULL;
retval->nil->flags = GTK_RBNODE_BLACK;
retval->nil->count = 0;
retval->nil->offset = 0;
retval->nil->parity = 0;
retval->root = retval->nil;
return retval;
}
static void
_gtk_rbtree_free_helper (GtkRBTree *tree,
GtkRBNode *node,
gpointer data)
{
if (node->children)
_gtk_rbtree_free (node->children);
_gtk_rbnode_free (node);
}
void
_gtk_rbtree_free (GtkRBTree *tree)
{
_gtk_rbtree_traverse (tree,
tree->root,
G_POST_ORDER,
_gtk_rbtree_free_helper,
NULL);
if (tree->parent_node &&
tree->parent_node->children == tree)
tree->parent_node->children = NULL;
_gtk_rbnode_free (tree->nil);
g_free (tree);
}
void
_gtk_rbtree_remove (GtkRBTree *tree)
{
GtkRBTree *tmp_tree;
GtkRBNode *tmp_node;
gint height = tree->root->offset;
if (gtk_debug_flags & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tree);
tmp_tree = tree->parent_tree;
tmp_node = tree->parent_node;
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
tmp_node->offset -= height;
/* If the removed tree was odd, flip all parents */
if (tree->root->parity)
tmp_node->parity = !tmp_node->parity;
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
tmp_tree = tree->parent_tree;
tmp_node = tree->parent_node;
_gtk_rbtree_free (tree);
if (gtk_debug_flags & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tmp_tree);
}
GtkRBNode *
_gtk_rbtree_insert_after (GtkRBTree *tree,
GtkRBNode *current,
gint height)
{
GtkRBNode *node;
gboolean right = TRUE;
GtkRBNode *tmp_node;
GtkRBTree *tmp_tree;
if (gtk_debug_flags & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tree);
if (current != NULL && current->right != tree->nil)
{
current = current->right;
while (current->left != tree->nil)
current = current->left;
right = FALSE;
}
/* setup new node */
node = _gtk_rbnode_new (tree, height);
node->parent = (current?current:tree->nil);
/* insert node in tree */
if (current)
{
if (right)
current->right = node;
else
current->left = node;
tmp_node = node->parent;
tmp_tree = tree;
}
else
{
tree->root = node;
tmp_node = tree->parent_node;
tmp_tree = tree->parent_tree;
}
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
/* We only want to propagate the count if we are in the tree we
* started in. */
if (tmp_tree == tree)
tmp_node->count++;
tmp_node->parity += 1;
tmp_node->offset += height;
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
_gtk_rbtree_insert_fixup (tree, node);
if (gtk_debug_flags & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tree);
return node;
}
GtkRBNode *
_gtk_rbtree_insert_before (GtkRBTree *tree,
GtkRBNode *current,
gint height)
{
GtkRBNode *node;
gboolean left = TRUE;
GtkRBNode *tmp_node;
GtkRBTree *tmp_tree;
if (gtk_debug_flags & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tree);
if (current != NULL && current->left != tree->nil)
{
current = current->left;
while (current->right != tree->nil)
current = current->right;
left = FALSE;
}
/* setup new node */
node = _gtk_rbnode_new (tree, height);
node->parent = (current?current:tree->nil);
/* insert node in tree */
if (current)
{
if (left)
current->left = node;
else
current->right = node;
tmp_node = node->parent;
tmp_tree = tree;
}
else
{
tree->root = node;
tmp_node = tree->parent_node;
tmp_tree = tree->parent_tree;
}
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
/* We only want to propagate the count if we are in the tree we
* started in. */
if (tmp_tree == tree)
tmp_node->count++;
tmp_node->parity += 1;
tmp_node->offset += height;
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
_gtk_rbtree_insert_fixup (tree, node);
if (gtk_debug_flags & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tree);
return node;
}
GtkRBNode *
_gtk_rbtree_find_count (GtkRBTree *tree,
gint count)
{
GtkRBNode *node;
node = tree->root;
while (node != tree->nil && (node->left->count + 1 != count))
{
if (node->left->count >= count)
node = node->left;
else
{
count -= (node->left->count + 1);
node = node->right;
}
}
if (node == tree->nil)
return NULL;
return node;
}
void
_gtk_rbtree_node_set_height (GtkRBTree *tree,
GtkRBNode *node,
gint height)
{
gint diff = height - GTK_RBNODE_GET_HEIGHT (node);
GtkRBNode *tmp_node = node;
GtkRBTree *tmp_tree = tree;
if (diff == 0)
return;
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
tmp_node->offset += diff;
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
}
void
_gtk_rbtree_node_mark_invalid (GtkRBTree *tree,
GtkRBNode *node)
{
if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID))
return;
GTK_RBNODE_SET_FLAG (node, GTK_RBNODE_INVALID);
do
{
if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_DESCENDANTS_INVALID))
return;
GTK_RBNODE_SET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
node = node->parent;
if (node == NULL)
{
node = tree->parent_node;
tree = tree->parent_tree;
}
}
while (node);
}
void
_gtk_rbtree_node_mark_valid (GtkRBTree *tree,
GtkRBNode *node)
{
if (! GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID))
return;
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_INVALID);
do
{
if (GTK_RBNODE_FLAG_SET (node, GTK_RBNODE_INVALID) ||
(node->children && GTK_RBNODE_FLAG_SET (node->children->root, GTK_RBNODE_DESCENDANTS_INVALID)) ||
(node->left && GTK_RBNODE_FLAG_SET (node->left, GTK_RBNODE_DESCENDANTS_INVALID)) ||
(node->right && GTK_RBNODE_FLAG_SET (node->right, GTK_RBNODE_DESCENDANTS_INVALID)))
return;
GTK_RBNODE_UNSET_FLAG (node, GTK_RBNODE_DESCENDANTS_INVALID);
node = node->parent;
if (node == NULL)
{
node = tree->parent_node;
tree = tree->parent_tree;
}
}
while (node);
}
typedef struct _GtkRBReorder
{
GtkRBTree *children;
gint height;
gint flags;
gint order;
gint invert_order;
gint parity;
} GtkRBReorder;
static int
gtk_rbtree_reorder_sort_func (gconstpointer a,
gconstpointer b)
{
return ((GtkRBReorder *) a)->order > ((GtkRBReorder *) b)->order;
}
static int
gtk_rbtree_reorder_invert_func (gconstpointer a,
gconstpointer b)
{
return ((GtkRBReorder *) a)->invert_order > ((GtkRBReorder *) b)->invert_order;
}
static void
gtk_rbtree_reorder_fixup (GtkRBTree *tree,
GtkRBNode *node)
{
if (node == tree->nil)
return;
node->parity = 1;
if (node->left != tree->nil)
{
gtk_rbtree_reorder_fixup (tree, node->left);
node->offset += node->left->offset;
node->parity += node->left->parity;
}
if (node->right != tree->nil)
{
gtk_rbtree_reorder_fixup (tree, node->right);
node->offset += node->right->offset;
node->parity += node->right->parity;
}
if (node->children)
{
node->offset += node->children->root->offset;
node->parity += node->children->root->parity;
}
}
/* It basically pulls everything out of the tree, rearranges it, and puts it
* back together. Our strategy is to keep the old RBTree intact, and just
* rearrange the contents. When that is done, we go through and update the
* heights. There is probably a more elegant way to write this function. If
* anyone wants to spend the time writing it, patches will be accepted.
*/
void
_gtk_rbtree_reorder (GtkRBTree *tree,
gint *new_order,
gint length)
{
GtkRBReorder reorder;
GArray *array;
GtkRBNode *node;
gint i;
g_return_if_fail (tree != NULL);
g_return_if_fail (length > 0);
g_return_if_fail (tree->root->count == length);
/* Sort the trees values in the new tree. */
array = g_array_sized_new (FALSE, FALSE, sizeof (GtkRBReorder), length);
for (i = 0; i < length; i++)
{
reorder.order = new_order[i];
reorder.invert_order = i;
g_array_append_val (array, reorder);
}
g_array_sort(array, gtk_rbtree_reorder_sort_func);
/* rewind node*/
node = tree->root;
while (node && node->left != tree->nil)
node = node->left;
for (i = 0; i < length; i++)
{
g_assert (node != tree->nil);
g_array_index (array, GtkRBReorder, i).children = node->children;
g_array_index (array, GtkRBReorder, i).flags = GTK_RBNODE_NON_COLORS & node->flags;
g_array_index (array, GtkRBReorder, i).height = GTK_RBNODE_GET_HEIGHT (node);
node = _gtk_rbtree_next (tree, node);
}
g_array_sort (array, gtk_rbtree_reorder_invert_func);
/* rewind node*/
node = tree->root;
while (node && node->left != tree->nil)
node = node->left;
/* Go through the tree and change the values to the new ones. */
for (i = 0; i < length; i++)
{
reorder = g_array_index (array, GtkRBReorder, i);
node->children = reorder.children;
if (node->children)
node->children->parent_node = node;
node->flags = GTK_RBNODE_GET_COLOR (node) | reorder.flags;
/* We temporarily set the height to this. */
node->offset = reorder.height;
node = _gtk_rbtree_next (tree, node);
}
gtk_rbtree_reorder_fixup (tree, tree->root);
}
gint
_gtk_rbtree_node_find_offset (GtkRBTree *tree,
GtkRBNode *node)
{
GtkRBNode *last;
gint retval;
g_assert (node);
g_assert (node->left);
retval = node->left->offset;
while (tree && node && node != tree->nil)
{
last = node;
node = node->parent;
/* Add left branch, plus children, iff we came from the right */
if (node->right == last)
retval += node->offset - node->right->offset;
if (node == tree->nil)
{
node = tree->parent_node;
tree = tree->parent_tree;
/* Add the parent node, plus the left branch. */
if (node)
retval += node->left->offset + GTK_RBNODE_GET_HEIGHT (node);
}
}
return retval;
}
gint
_gtk_rbtree_node_find_parity (GtkRBTree *tree,
GtkRBNode *node)
{
GtkRBNode *last;
gint retval;
g_assert (node);
g_assert (node->left);
retval = node->left->parity;
while (tree && node && node != tree->nil)
{
last = node;
node = node->parent;
/* Add left branch, plus children, iff we came from the right */
if (node->right == last)
retval += node->parity - node->right->parity;
if (node == tree->nil)
{
node = tree->parent_node;
tree = tree->parent_tree;
/* Add the parent node, plus the left branch. */
if (node)
retval += node->left->parity + 1; /* 1 == GTK_RBNODE_GET_PARITY() */
}
}
return retval % 2;
}
gint
_gtk_rbtree_find_offset (GtkRBTree *tree,
gint height,
GtkRBTree **new_tree,
GtkRBNode **new_node)
{
GtkRBNode *tmp_node;
if (height < 0)
{
*new_tree = NULL;
*new_node = NULL;
return 0;
}
tmp_node = tree->root;
while (tmp_node != tree->nil &&
(tmp_node->left->offset > height ||
(tmp_node->offset - tmp_node->right->offset) < height))
{
if (tmp_node->left->offset > height)
tmp_node = tmp_node->left;
else
{
height -= (tmp_node->offset - tmp_node->right->offset);
tmp_node = tmp_node->right;
}
}
if (tmp_node == tree->nil)
{
*new_tree = NULL;
*new_node = NULL;
return 0;
}
if (tmp_node->children)
{
if ((tmp_node->offset -
tmp_node->right->offset -
tmp_node->children->root->offset) > height)
{
*new_tree = tree;
*new_node = tmp_node;
return (height - tmp_node->left->offset);
}
return _gtk_rbtree_find_offset (tmp_node->children,
height - tmp_node->left->offset -
(tmp_node->offset -
tmp_node->left->offset -
tmp_node->right->offset -
tmp_node->children->root->offset),
new_tree,
new_node);
}
*new_tree = tree;
*new_node = tmp_node;
return (height - tmp_node->left->offset);
}
void
_gtk_rbtree_remove_node (GtkRBTree *tree,
GtkRBNode *node)
{
GtkRBNode *x, *y;
GtkRBTree *tmp_tree;
GtkRBNode *tmp_node;
gint node_height;
gint y_height;
g_return_if_fail (tree != NULL);
g_return_if_fail (node != NULL);
/* make sure we're deleting a node that's actually in the tree */
for (x = node; x->parent != tree->nil; x = x->parent)
;
g_return_if_fail (x == tree->root);
if (gtk_debug_flags & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tree);
if (node->left == tree->nil || node->right == tree->nil)
{
y = node;
}
else
{
y = node->right;
while (y->left != tree->nil)
y = y->left;
}
/* adjust count only beneath tree */
for (x = y; x != tree->nil; x = x->parent)
x->count--;
/* y->count = node->count; */
/* offsets and parity adjust all the way up through parent trees */
y_height = GTK_RBNODE_GET_HEIGHT (y);
node_height = GTK_RBNODE_GET_HEIGHT (node) + (node->children?node->children->root->offset:0);
/* Do this twice for code clarities sake. */
tmp_tree = tree;
tmp_node = y;
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
tmp_node->offset -= (y_height + (y->children?y->children->root->offset:0));
tmp_node->parity -= (1 + (y->children?y->children->root->parity:0));
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
/* x is y's only child */
if (y->left != tree->nil)
x = y->left;
else
x = y->right;
/* remove y from the parent chain */
x->parent = y->parent;
if (y->parent != tree->nil)
if (y == y->parent->left)
y->parent->left = x;
else
y->parent->right = x;
else
tree->root = x;
if (y != node)
{
gint diff;
/* Copy the node over */
if (GTK_RBNODE_GET_COLOR (node) == GTK_RBNODE_BLACK)
node->flags = ((y->flags & (GTK_RBNODE_NON_COLORS)) | GTK_RBNODE_BLACK);
else
node->flags = ((y->flags & (GTK_RBNODE_NON_COLORS)) | GTK_RBNODE_RED);
node->children = y->children;
/* We want to see how different our height is from the previous node.
* To do this, we compare our current height with our supposed height.
*/
diff = y_height - GTK_RBNODE_GET_HEIGHT (node);
if (diff != 0)
{
tmp_tree = tree;
tmp_node = node;
while (tmp_tree && tmp_node && tmp_node != tmp_tree->nil)
{
tmp_node->offset += diff;
tmp_node = tmp_node->parent;
if (tmp_node == tmp_tree->nil)
{
tmp_node = tmp_tree->parent_node;
tmp_tree = tmp_tree->parent_tree;
}
}
}
}
if (GTK_RBNODE_GET_COLOR (y) == GTK_RBNODE_BLACK)
_gtk_rbtree_remove_node_fixup (tree, x);
_gtk_rbnode_free (y);
if (gtk_debug_flags & GTK_DEBUG_TREE)
_gtk_rbtree_test (G_STRLOC, tree);
}
GtkRBNode *
_gtk_rbtree_next (GtkRBTree *tree,
GtkRBNode *node)
{
g_return_val_if_fail (tree != NULL, NULL);
g_return_val_if_fail (node != NULL, NULL);
/* Case 1: the node's below us. */
if (node->right != tree->nil)
{
node = node->right;
while (node->left != tree->nil)
node = node->left;
return node;
}
/* Case 2: it's an ancestor */
while (node->parent != tree->nil)
{
if (node->parent->right == node)
node = node->parent;
else
return (node->parent);
}
/* Case 3: There is no next node */
return NULL;
}
GtkRBNode *
_gtk_rbtree_prev (GtkRBTree *tree,
GtkRBNode *node)
{
g_return_val_if_fail (tree != NULL, NULL);
g_return_val_if_fail (node != NULL, NULL);
/* Case 1: the node's below us. */
if (node->left != tree->nil)
{
node = node->left;
while (node->right != tree->nil)
node = node->right;
return node;
}
/* Case 2: it's an ancestor */
while (node->parent != tree->nil)
{
if (node->parent->left == node)
node = node->parent;
else
return (node->parent);
}
/* Case 3: There is no next node */
return NULL;
}
void
_gtk_rbtree_next_full (GtkRBTree *tree,
GtkRBNode *node,
GtkRBTree **new_tree,
GtkRBNode **new_node)
{
g_return_if_fail (tree != NULL);
g_return_if_fail (node != NULL);
g_return_if_fail (new_tree != NULL);
g_return_if_fail (new_node != NULL);
if (node->children)
{
*new_tree = node->children;
*new_node = (*new_tree)->root;
while ((*new_node)->left != (*new_tree)->nil)
*new_node = (*new_node)->left;
return;
}
*new_tree = tree;
*new_node = _gtk_rbtree_next (tree, node);
while ((*new_node == NULL) &&
(*new_tree != NULL))
{
*new_node = (*new_tree)->parent_node;
*new_tree = (*new_tree)->parent_tree;
if (*new_tree)
*new_node = _gtk_rbtree_next (*new_tree, *new_node);
}
}
void
_gtk_rbtree_prev_full (GtkRBTree *tree,
GtkRBNode *node,
GtkRBTree **new_tree,
GtkRBNode **new_node)
{
g_return_if_fail (tree != NULL);
g_return_if_fail (node != NULL);
g_return_if_fail (new_tree != NULL);
g_return_if_fail (new_node != NULL);
*new_tree = tree;
*new_node = _gtk_rbtree_prev (tree, node);
if (*new_node == NULL)
{
*new_node = (*new_tree)->parent_node;
*new_tree = (*new_tree)->parent_tree;
}
else
{
while ((*new_node)->children)
{
*new_tree = (*new_node)->children;
*new_node = (*new_tree)->root;
while ((*new_node)->right != (*new_tree)->nil)
*new_node = (*new_node)->right;
}
}
}
gint
_gtk_rbtree_get_depth (GtkRBTree *tree)
{
GtkRBTree *tmp_tree;
gint depth = 0;
tmp_tree = tree->parent_tree;
while (tmp_tree)
{
++depth;
tmp_tree = tmp_tree->parent_tree;
}
return depth;
}
static void
_gtk_rbtree_traverse_pre_order (GtkRBTree *tree,
GtkRBNode *node,
GtkRBTreeTraverseFunc func,
gpointer data)
{
if (node == tree->nil)
return;
(* func) (tree, node, data);
_gtk_rbtree_traverse_pre_order (tree, node->left, func, data);
_gtk_rbtree_traverse_pre_order (tree, node->right, func, data);
}
static void
_gtk_rbtree_traverse_post_order (GtkRBTree *tree,
GtkRBNode *node,
GtkRBTreeTraverseFunc func,
gpointer data)
{
if (node == tree->nil)
return;
_gtk_rbtree_traverse_post_order (tree, node->left, func, data);
_gtk_rbtree_traverse_post_order (tree, node->right, func, data);
(* func) (tree, node, data);
}
void
_gtk_rbtree_traverse (GtkRBTree *tree,
GtkRBNode *node,
GTraverseType order,
GtkRBTreeTraverseFunc func,
gpointer data)
{
g_return_if_fail (tree != NULL);
g_return_if_fail (node != NULL);
g_return_if_fail (func != NULL);
g_return_if_fail (order <= G_LEVEL_ORDER);
switch (order)
{
case G_PRE_ORDER:
_gtk_rbtree_traverse_pre_order (tree, node, func, data);
break;
case G_POST_ORDER:
_gtk_rbtree_traverse_post_order (tree, node, func, data);
break;
case G_IN_ORDER:
case G_LEVEL_ORDER:
default:
g_warning ("unsupported traversal order.");
break;
}
}
static gint
_count_nodes (GtkRBTree *tree,
GtkRBNode *node)
{
gint res;
if (node == tree->nil)
return 0;
g_assert (node->left);
g_assert (node->right);
res = (_count_nodes (tree, node->left) +
_count_nodes (tree, node->right) + 1);
if (res != node->count)
g_print ("Tree failed\n");
return res;
}
static guint
get_parity (GtkRBNode *node)
{
guint child_total = 0;
guint rem;
/* The parity of a node is node->parity minus
* the parity of left, right, and children.
*
* This is equivalent to saying that if left, right, children
* sum to 0 parity, then node->parity is the parity of node,
* and if left, right, children are odd parity, then
* node->parity is the reverse of the node's parity.
*/
child_total += (guint) node->left->parity;
child_total += (guint) node->right->parity;
if (node->children)
child_total += (guint) node->children->root->parity;
rem = child_total % 2;
if (rem == 0)
return node->parity;
else
return !node->parity;
}
static guint
count_parity (GtkRBTree *tree,
GtkRBNode *node)
{
guint res;
if (node == tree->nil)
return 0;
res =
count_parity (tree, node->left) +
count_parity (tree, node->right) +
(guint)1 +
(node->children ? count_parity (node->children, node->children->root) : 0);
res = res % (guint)2;
if (res != node->parity)
g_print ("parity incorrect for node\n");
if (get_parity (node) != 1)
g_error ("Node has incorrect parity %d", get_parity (node));
return res;
}
static void
_gtk_rbtree_test_height (GtkRBTree *tree,
GtkRBNode *node)
{
gint computed_offset = 0;
/* This whole test is sort of a useless truism. */
if (node->left != tree->nil)
computed_offset += node->left->offset;
if (node->right != tree->nil)
computed_offset += node->right->offset;
if (node->children && node->children->root != node->children->nil)
computed_offset += node->children->root->offset;
if (GTK_RBNODE_GET_HEIGHT (node) + computed_offset != node->offset)
g_error ("node has broken offset\n");
if (node->left != tree->nil)
_gtk_rbtree_test_height (tree, node->left);
if (node->right != tree->nil)
_gtk_rbtree_test_height (tree, node->right);
if (node->children && node->children->root != node->children->nil)
_gtk_rbtree_test_height (node->children, node->children->root);
}
void
_gtk_rbtree_test (const gchar *where,
GtkRBTree *tree)
{
GtkRBTree *tmp_tree;
/* Test the entire tree */
tmp_tree = tree;
while (tmp_tree->parent_tree)
tmp_tree = tmp_tree->parent_tree;
g_print ("%s: whole tree offset is %d\n", where, tmp_tree->root->offset);
if (tmp_tree->root != tmp_tree->nil)
{
g_assert ((_count_nodes (tmp_tree, tmp_tree->root->left) +
_count_nodes (tmp_tree, tmp_tree->root->right) + 1) == tmp_tree->root->count);
_gtk_rbtree_test_height (tmp_tree, tmp_tree->root);
g_assert (count_parity (tmp_tree, tmp_tree->root) == tmp_tree->root->parity);
}
}
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